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Electrical Meters, Battery, And Galley Power Module (P5-13)
You put the BAT switch to the ON position to energize these buses and components with battery power:
-Switched hot battery bus
-Battery bus
-Static inverter
-AC standby bus
-DC standby bus
-P5-13 alphanumeric display.
You use the GALLEY switch to control power to all galleys.
You use the dc and ac selectors and the alphanumeric display to monitor the electrical power system power sources.
Generator Drive And Standby Power Module (P5-5)
The generator drive disconnect switch operates the disconnect mechanism for its integrated drive generator (IDG). This removes engine accessory gearbox power from
737-600/700/800/900 TRAINING MANUAL
the IDG. The engine start lever must be in the idle position for the disconnect function to operate.
The standby power switch gives you manual control of the ac and dc standby power bus sources. In the auto position, the ac standby bus receives power from ac transfer bus 1, and the dc standby bus receives power from dc bus 1 when these sources are available. If the sources are not available, the ac standby bus receives power from the static inverter, and the dc bus receives power from the battery.
These are the effects of the standby power switch in the other two positions:
-Deenergize the ac standby bus and the dc standby
bus (OFF position)
-Energize the ac standby bus with battery power
through the static inverter (BAT position)
-Energize the dc standby bus with battery power
(BAT position).
AC Systems, Generator, And APU Module (P5-4)
You use the ground power switch to control external power to the ac transfer buses. The blue GRD POWER AVAILABLE light above the switch shows if the ground source is connected and quality is good. The two ac transfer buses receive power when you put the ground power switch to the ON position. Initial power sources are removed before the transfer buses receive external power.
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737 GENERAL -- ELECTRICAL POWER OPERATION
The bus transfer switch gives you manual control of the BTBs and the dc bus tie relay. In the AUTO position, the BTBs and the dc bus tie relay operate as necessary.
In the OFF position, the BTBs open and isolate the ac transfer buses from each other. The dc bus tie relay also opens. This isolates dc bus 1 and dc bus 2 from each other. The position also resets the BTB trip circuits.
You use the GEN 1 and GEN 2 switches to supply IDG power to an ac transfer bus. The ac transfer bus on that side goes to IDG power when you temporarily put the switch to the ON position. Initial power sources are removed.
You use the APU GEN switches to supply power to the ac transfer buses. There are two switches because there are two bus tie breakers (BTBs) that supply power to the ac transfer buses. The two ac transfer buses receive APU power with operation of one APU GEN switch if the ac transfer buses do not have power initially. If the ac transfer buses do have power, then only the ac transfer bus on the same side as the APU GEN switch you operate energizes with APU power.
The blue APU GEN OFF BUS light comes on when the APU is ready to supply electrical power.
Forward Flight Attendant Panel
You use the ground service switch to supply external power to ground service bus 1 and 2 with external power connected. This makes it possible to supply electrical
737-600/700/800/900 TRAINING MANUAL
power for cabin servicing without access to the flight compartment.

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737-600/700/800/900 TRAINING MANUAL

DC AMPS CPS FREQ

00-00-00-247 Rev 1 03/20/1997
DC VOLTS/AC AMPS/AC VOLTS
BAT DISCHARGE TR UNIT ELEC
MAINT
APU GEN TR1 TR2 GEN2 GEN1 BAT
BAT
GRD BUS
TR3 INVPWR
ELECTRICAL METERS
TEST
TEST PWR
STBY STBY
PWR
BATTERY AND GALLEY
OFF OFF
POWER MODULE
(P5-13)
BAT GALLEY
ON ON
DC AC
1 2
STANDBY
PWR OFF
DRIVE
STANDBY POWER
DRIVE

GENERATOR DRIVE FLIGHT COMPARTMENT
DISCONNECT DISCONNECT
AND STANDBY
BAT OFF AUTO
POWER MODULE (P5-5)
GRD POWER AVAILABLE
GRD PWR OFF
ON
AC SYSTEM
BUS TRANSFER
A
O U
GENERATOR AND
TRANSFER TRANSFER
F T
BUS OFF BUS OFF
F
APU MODULE
O
SOURCE
SOURCE OFF
OFF
(P5-4)FORWARD ATTENDANT PANEL
GEN OFF
GEN OFF BUS
APU GEN BUSOFF BUS
GROUND SERVICE SWITCH
OFF OFF
ON ON
GEN 1 APU GEN GEN 2
APU

737 GENERAL - ELECTRICAL POWER OPERATION
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